Mapei Mapegrout T60

Technical Characteristics

Mapegrout T60 is a one-component pre-blended thixotropic cement-based mortar composed of sulphate-resistant hydraulic binders, synthetic polyacrylonitrile fibres, organic corrosion inhibitors, select aggregates and special waterretaining admixtures developed in the MAPEI Research Laboratories.

If Mapegrout T60 is prepared by only adding water, it must be cured under damp conditions in order to guarantee that the product’s expansive properties develop completely and correctly. However, there is no guarantee that these conditions can be created on site.

Therefore, to guarantee that the expansive properties of Mapegrout T60 take place when drying in the open air, 0.25% of Mapecure SRA, a special admixture which has the property of reducing both plastic and hydraulic shrinkage, may be used to great advantage when added to the mix.

Mapecure SRA has a very important role to play in guaranteeing better curing of mortar. Also, when mixed with Mapegrout T60, it may be considered a technologically advanced system, in that the admixture has the capacity of slowing down evaporation of the water and of promoting the development of hydration reactions.

Mapecure SRA behaves like an internal curing agent and, thanks to its interaction with some of the main components which make up the cement, it helps to reduce shrinkage by between 20% and 50% compared with the standard values of the product without the admixture. This will obviously lead to a reduced risk of cracking phenomena.

Mapegrout T60 may be used also without adding Mapecure SRA, when the environmental conditions permit optimal curing.

Mapegrout T60 meets the requirements defined by EN 1504-9 (“Products and systems for the protection and repair of concrete structures - Definitions, requirements, quality control and evaluation of conformity - General principles for use of products and systems”) and the minimum requirements claimed by EN 1504-3 (“Structural and non-structural repair”) for structural mortars of class R4.

Application Procedure

*To allow expansion in air

Preparation of the substrate

• Remove deteriorated and loose concrete down to the solid, strong and roughened part of the substrate. Any previous repair work that is no longer thoroughly bonded must also be removed through suitable means (mechanical demolition, hydroscarifying, etc).
• Clean concrete and reinforcing rods from residues of previous scarifying works, dust, cement laitance, rust, grease, oils, paint residues and any other contaminants, through sandblasting or high pressure water jets. Once prepared, the concrete surface to be repaired must be completely visible and have an uneven texture with at least 5 mm peak roughness, with inert fraction completely exposed and free from laitance, in order to grant correct adhesion of the mortar to the substrate.
• Saturate the substrate with water, then wait until the excess water has evaporated and the surface is dry before repairing with Mapegrout T60. To facilitate the elimination of free water, use compressed air if needed.

Application of the mortar

Mapegrout T60 may be applied with a spatula or trowel on vertical surfaces in layers up to 10 cm thick per coat, or on ceilings in layers up to 2 cm thick per coat, without the use of reinforcing rebars.

For application thickness between 10 and 50 mm repair can be carried out in one single coat. In case of repair thickness over 30 mm, the use of reinforcing rebars is required.

For application thickness between 50 an 100 mm repaired must be carried out in more coats (also consecutive), with application of reinforcing rebars and at least 2 cm covering. Apply approximately ¾ of the total thickness in one coat until the rebar is completely covered, using a suitable tool to create a surface roughness between 5 and 10 mm (10 mm notched trowel). The second coat may be applied after 24 hours. Before application, scarify the first coat with high pressure water jets until a clean and laitance-free substrate with at least 5 mm roughness is obtained.

Mapegrout T60 may also be applied using a suitable double-mixing piston or worm-screw type rendering machine. The product is not compatible with application through continuous mixing type rendering machine.

For repairing concrete faces (e.g. balconies, columns, beams, etc.) we recommend treating the rebars with Mapefer or Mapefer 1K after sanding them.